[FEATURE] Allow changing of tracking branch on push

[EreMaijala]

It would be nice if there was an option in the Push dialog to set tracking to the newly created branch when pushing to new branch. Often the new branch would be the target of further commits as well, and this would save one from manually changing the tracking branch after push, which can be quite slow when there are a lot of remotes and branches.

[love-linger]

You can try this build from https://github.com/sourcegit-scm/sourcegit/actions/runs/9232641346 to test this feature

[EreMaijala]

@love-linger Awesome, thanks! Seems to work great. :) Perhaps I'd change the English text to Set as tracking branch to align it with the style of the other options, but that's just a nitpick.